add disallow user register feature support

[alimy]

• add disallow user register feature support

add custom whether provide user register configure in web/.env support.
Set the value of VITE_ALLOW_USER_REGISTER in file web/.env to custom whether provide user register feature.

    # file: web/.env or web/.env.local
    ...
    # 局部参数
    VITE_ALLOW_USER_REGISTER=true
    ...

and disallow user register in backend(add Web:DisallowUserRegister feature in config.yaml):

    # file config.yaml
    ...
    Features:
      Default: ["Base", "Postgres", "Zinc", "LocalOSS", "LoggerZinc", "BigCacheIndex", "Friendship", "Service", "Web:DisallowUserRegister"]
    ...